Huge, slow-talking Jerry Blackwood, a native of Mars (the one in Yorkshire) believes he could solve the troubles of the world if he could only talk to the world's leaders for half an hour, man to man. One day, chasing his wandering dog, he blunders past the perimeter of the top-secret launch site of England's first intercontinental rocket, accidentally launching it. And when the rocket, with Jerry inside, lands in the United States...on an Indian reservation...